It definitely makes the humans out as weaklings too, who can get mind-wiped at will and then be kindly left to be friends with the guy who gets to keep his memories because he is special, a friend who is also hurt because he's never going to have a fully real friendship with them ever again.

It's a powerful ending, but plenty of evil people are powerful, so I've never bought the idea that "Rocks Fall, Stuff Sucks" is better than one that makes you shake your first in triumph. I mean, yes, sacrifices must often be paid, but (A) children's series and (B) most people know that or figure it out in their own life.